NSTreeController：如何找到节点的父级？

Question

I'm looking for a similar method to: NSOutlineView parentForItem: for NSTreeController.

I need to know the parent of a node in the tree.

Answer 1

Nodes in an NSTreeController are instances of NSTreeNode , and NSTreeNode has a read-only parentNode property - so use that.

The short snippet below gets the parent node of the first node in the tree-controller's selectedNodes array:

let selectedNode = tree.selectedNodes.first! as! NSTreeNode
let parentOfSelectedNode = selectedNode.parentNode!